/*@@
   @header    Symmetry.h
   @date      Sun 7th Mar 1999
   @author    Gerd Lanfermann
   @desc 
   The extensions to the GH structure for 3D grid symmetry Treatment
   We'll have six int array for every GF, which holds a flag for which symmetry or 
   (physical) bnd-condition to apply at the grid faces.

   * These tables are set by SetSymmetry(GF,int,int,int) 
     during initialization. 
   * Default values ?
   * The information is used during evolution by Einstein_DoBound(GF), 
     Einstein_DoSym(GF)

   @endhistory
   @version 
 @@*/


#define GFSYM_UNSET -42
#define GFSYM_NOSYM -41

typedef struct Symmetry {

  /* Symmetry[0..GF-1][0..dim-1] */
  /* in each direction [0,..dim-1], this will hold the symmetry 
     operation across that plane, iff the grid layout requires this.
     this compares to the {sx,sy,sz} of Cactus3.2  */
  int **GFSym;

} SymmetryGHex;